BRPI0802373B1 - PROCESS FOR OBSERVING PROOF FABRICS AND OBTAINED FABRIC - Google Patents

Abstract

process for obtaining tear proof fabrics and obtained tissue. a tear-proof type weaving machine (1) comprising knitting devices (4) and at least one rail bar (2) including a plurality of rail (2a) guiding a plurality of yarns (10 ) towards the entanglers (4), wherein each of the struts (2a) belonging to at least one of the strut bars (2) guides a plurality of strands (10).

Description

(54) Title: PROCESS FOR OBTAINING TISSUE PROOF AND FABRIC PROOF (51) Int.CI .: D04B 27/06; D04B 21/18 (30) Unionist Priority: 07/20/2007 EP 07425448.3 (73) Holder (s): CARVICO S.P.A.

(72) Inventor (s): LAURA CALISSONI (85) National Phase Start Date: 07/15/2008

1/9

“PROCESS FOR OBTAINING TISSUES FROM CHALLENGING PROOF AND TISSUE OBTAINED”

Field of the Invention

The present invention relates to a process for obtaining frayproof fabrics, of the type described in the preamble of the first claim and a fabric obtained with said process.

Background of the Invention As is known, fabrics are produced by a plurality of threads arranged according to particular periodic geometries that allow the reciprocal connection of said threads and the formation of meshes.

Therefore, the characteristics of the fabrics are established by the geometries of the interlacing, by the typology of the threads and, finally, by the dimensions of the meshes.

In particular, so-called stretch-proof elastic fabrics are produced by a base interlacing that comprises a plurality of yarns that unwind in a single direction, called a warp, and are combined together by substantially rigid yarns and by substantially elastic yarns .

Upholstery-proof stretch fabrics are used for various applications and, in particular, for clothing or dresses such as bathing suits, sportswear, underwear, and other clothing.

The fabrics in question are made industrially by express weaving machines, with a tear-proof type loom, which comprise a system for transporting and moving the threads, which are inserted through the hole of express perforated elements, called passetes, and fall back. on a row of needles, arranged transversely to the direction of the threads.

In addition, said needles and passets are arranged periodically along express bars, which extend in a longitudinal direction.

In particular, a plurality of bars is present

2/9 runners, one for each different yarn that makes up the base interlacing, and one for needle bars and other knitting devices, which perform different functions.

In the details, each base interlacing thread passes through the hole of a different loop and, subsequently, the threads interact simultaneously with the needles located below.

An example of a schematic section of a well-known weaving machine, with a tear-proof type loom, is shown in Fig. 1 where two different, substantially identical pass bars are illustrated, each carrying a wire to three device bars. gillers placed below that, interacting with each other, make the fabric.

When these machines are activated, the pins and needles are moved with alternate movements, while the threads are moved with a continuous movement. In particular, the yarns have continuous vertical and downward movement and the walkways, which in turn, move the yarns later, with alternating longitudinal and transversal movement.

The needles, placed under the pins and which interact with the threads moved by the pins, are moved with alternating vertical movement.

Among the fabrics made with said machines, it was recently developed by the Applicant a fabric consisting of a base interlacing that has a plurality of threads and, in particular, two threads substantially parallel.

In particular, in this type of fabric, the base interlacing is provided with either elastic yarns, composed of elastomers such as lycra® or similar, or non-elastic yarns, composed of polyamides or similar.

These fabrics have ideal strength and limited thickness characteristics.

In these fabrics, the elastic threads, which are hardly

3/9 dyeable and have worse aesthetic characteristics, are hidden by non-elastic threads.

However, it was found that the elastic yarns sometimes do not remain aligned behind the non-elastic yarns and protrude from the outside, worsening the outer appearance of the fabric, from a visual and tactile point of view.

In addition, it should be noted that the yarns with very fine numbers cause a reduced productivity of the weaving machines and, consequently, an increase in costs for making them.

Description of the Invention

In this situation, the technical task, laid at the foundation of the present invention, is to design a stretch-proof elastic fabric in conditions to substantially obviate the above mentioned inconveniences.

Within the scope of said technical task, it is an important objective of the invention to carry out a procedure, for the production of frayproof fabrics, capable of making fabrics, in particular, fabrics that comprise a basic interlacing with threads arranged in parallel, with better characteristics aesthetic and superficial.

A further objective of the invention is to obtain a procedure for making frayproof fabrics that have a high productivity.

The technical task and the specified objectives are achieved by a stretch-proof elastic fabric as claimed in the attached Claim 1.

Preferred executions are evidenced in the dependent claims.

Further features and advantages of the invention are further clarified below by the detailed description of preferred embodiments of the invention, with reference to the accompanying drawings, in which.

Brief Description of Drawings

Figure 1 shows the section of the main portion of a weaving machine according to the known technique;

Figure 2a shows the section of the main portion of

4/9 a weaving machine capable of carrying out the procedure according to the invention;

Figure 2b shows an enlargement of the section of the main portion of a weaving machine capable of carrying out the procedure according to the invention, illustrated in Fig. 2a;

Figure 2c shows a further enlargement of the section of the main portion of a weaving machine capable of carrying out the procedure according to the invention, illustrated in Figures 2a and 2b;

Figure 3 illustrates the basic scheme of a fabric that can be carried out with the procedure according to the invention.

Best Mode for Carrying Out the Invention

With reference to the aforementioned Figures, the weaving machine to perform the procedure according to the invention is globally indicated with the number 1.

It is substantially and preferably a lint-free friction-proof loom, shown in Fig. 1.

These machines are partially known and marketed, for example, by the German company LIBA Maschinenfabrik GmbH under the name of Copcentra.

The weaving machine 1 comprises at least one pass bar 2, a system of gouging devices 3, and a transport system 5.

In particular, each strip bar 2 comprises a plurality of clips 2a periodically and parallel in the longitudinal direction 1a, perpendicular to the plane of the section illustrated in Fig. 2a and to the vertical directions 1b and transverse 1c.

The well-known system of gouging devices 3 comprises, in broad lines, a platinum bar 3a, a slide bar 3b and a needle bar 3c capable of hooking, dragging and gouging the threads according to a known procedure.

In particular, the system of gating devices 3 comprises a plurality of simple gating devices 4, and each

5/9 platinum bars 3a, slides 3b and needles 3c of the system of gouging devices 3 comprise respectively a plurality of stages 4a, slides 4b and needles 4c arranged parallel and periodically in longitudinal direction 1a, and which have the same spatial periodicity of the passette bars 2.

In addition, the aforementioned pass bars 2 and gating devices 4 move according to predetermined and periodic movements over time.

The procedure according to the invention provides for a plurality of wires 10 to be arranged on the conveyor system 5 and, in particular, on express loom cylinders or bobbins.

These loom cylinders, unfolding, allow the advances of the threads 10, their passage over express tensioning rods 6 and the continuous supply of the legs 2a and the gouging devices 4.

Therefore, the transport system 5 and, in particular, the tensioning rods 6, are suitable for determining the inclination with respect to the vertical direction 1b with which the wires 10 arrive at the walkways 2a.

The latter provide, through their periodic movement, described above, to the reciprocal interlacing of the threads 10 and the production of a frayproof type 11 fabric.

The procedure according to the invention provides that each passette 2a, belonging to at least one of said passette bars 2, guides a plurality of wires 10, and preferably two wires 10.

In particular, each passette 2a comprises an orifice 2b, through which a plurality of wires 10, and preferably two wires 10, pass, to be guided towards the gouging devices 4.

Preferably, this orifice 2b, intended for the passage of more wires 10, has a maximum free span dimension 2d greater than 1 mm and preferably about 2 mm.

In particular, the orifice 2b may be a preferably substantially circular hole with a diameter between 1 mm and 2 mm.

6/9

Alternatively, it is possible that more holes 2b are provided per pass 2a, preferably one for wire 10, or non-circular holes 2b but in a timely manner capable of allowing the passage of more wires 10, for example, oval.

Obviously, more bar strips 2 having runners 2a that each guide a plurality of strands 10, or bar strips 2 that have runners 2a that each guide a plurality of strands 10 coupled with bars runners 2 that have runners 2a that each guide a single thread 10 or other things.

Preferably, or in any case used, a single bar of passages 2 is provided, whose passages 2a guide two wires 10 and, in particular, an elastic thread 10a and a non-elastic thread 10b, which are better described below.

In addition, the transport system 5 guides the two wires 10, in different directions of advance 6a, which preferably form an intersection angle α between 10 ° and 60 ° and more preferably between 20 ° and 40 °.

These different feed directions 6a are suitable for not interfering with the two different wires 10 reciprocally in correspondence of the orifice 2b, as illustrated in Fig. 2c.

Therefore, two tensioning rods 6 are preferably present, a rear, on which the elastic thread 10a is arranged, and a front, on which the non-elastic thread 10b is arranged.

Here, a yarn having an elastic elongation of less than 20% of the total length is defined as substantially inelastic, while a yarn having an elongating elongation of a percentage greater than 80% of the total length is defined as substantially inelastic.

Thanks to this solution, it is possible to feed each pass bar 2 with two wires 10 having a different speed, defined by the speed of unwinding by the transport system 5.

7/9

In fact, it is often necessary to use different stresses and different axial elongations or strains for elastic and non-elastic yarns 10 and, as a result, unroll and advance the same yarns 10 at different speeds.

Furthermore, preferably, the density of passets 2a per inch (1 inch = 2.54 cm), in longitudinal direction 1a, is comprised between 32 and 44, and more preferably between 40-44.

Therefore, fabric 11 is defined by a base 12 interlacing, which is repeated periodically within fabric 11.

This base interlacing 12 comprises at least two wires 10 and provides for at least two wires 10 to be arranged in parallel.

In fact, the said two wires 10 are guided by a single loop 2a and, therefore, perform the same displacements, always staying parallel and closely touching.

In particular, in the base interlacing 12, only two threads 10 are provided: the elastic thread 10a and the non-elastic thread 10b.

The inelastic yarn 10b is made of materials of known type, it can be, for example, a polyamide multifiber yarn; alternatively, it can be made of polyester, polypropylene or other materials.

It has a number between 22 and 60 dTex and more appropriately between 22 and 44 dTex. As is well known, in dTex the number, or linear density, of the threads is measured, expressed in grams per ten kilometers (1 dTex = 0.1 g / km).

The elastic thread 10a is made of elastic material of known type, in particular, by elastomeric polymers or Lycra®. In addition, it has a number between 22 and 60 dTex.

The wires 10 are arranged according to interlacing determined by the reciprocating movement of the passbar bar 2.

For example, in Fig. 3 it is illustrated schematically

8/9 the base 12 interlacing preferred for fabric 11 according to the procedure.

In the same figure, a plurality of points are present, each of which represents a needle 4c of the first needle bar 3c in a temporary position. Needles 4c are arranged in horizontal lines, called rows, and in vertical lines, called rows. In reality the rows are defined by the periodic movement of the threads and the same needles, while the rows are defined by the horizontal positioning of the same needles. For this reason, a row of needles represents the periodic placement of the same needle, while each row represents a plurality of different needles.

The white spaces between the rows are numbered with natural numbers from 0 to 4 and represent the positions in which the loops 2a lay the threads.

In particular, the two wires 10a and 10b are both arranged according to a base interlacing 12 which has a periodicity of four meshes, in which three consecutive meshes are obtained on different needles 4c. The term consecutive means that no 4c needles are skipped.

This type of interlacing is technically called “Atlas with a periodicity of 4 meshes.

This interlacing may comprise closed or open meshes, in particular, of the four envisaged meshes, the closed meshes may vary in number from zero to four, while the remainder will be opened.

In Fig. 3 an interlacing is shown in which closed meshes are provided alternating with open meshes and, in particular, the open meshes are placed on the two lateral needles of the three needles 4c.

This interlacing 12 is defined by a movement of the passbar bar 2 corresponding to the spaces from 0 to 1 in a first row, from 2 to 1 in a second row, from 3 to 2 in a third row

9/9 row and 1 to 2 in the fourth row.

The invention achieves important advantages.

In fact, it was found that fabrics 11, made with the procedure according to the invention, have notably improved aesthetic and surface characteristics regarding the same types of fabrics 11, made with an identical base 12 interlacing but with a known type procedure , that is, with a procedure that foresees that each wire passes through the hole of a different pass, belonging to a different pass bar.

In particular, the aforementioned advantage is due to the fact that the threads 10, guided by a single loop 2a, always remain in proximity and, therefore, remain arranged according to the order established by the weaving machine 1 without the thread located in down and, in particular, the elastic thread 10 ^a , comes out onto the fabric surface 11.

In addition, for the same reason, there was a noticeable improvement in the tissue surface 11.

The improvements occurred especially in fabrics made with a four-mesh Atlas and two elastic 10a and non-elastic 10b yarns. In fact, this fabric 11, due to its fineness and complexity, is particularly exalted by the technical solution that provides for the insertion of the two threads in a single hole 2b of a passette 2a.

A further advantage is provided by the fact that it was possible to improve, thanks to the fact that it is necessary to move a single pass bar 2, the productivity of the machine 1 and, consequently, reduce the fabric costs 11.

1/2

Claims (9)

1. PROCESS FOR OBTAINING CHALLENGE-PROOF FABRICS on a weaving machine (1) with a fray proof type loom that includes gouging devices (4) and at least one pass bar (2), which includes a plurality of runners (2a), which comprise at least one hole (2b), which guide a plurality of wires (10) in the direction of said gouging devices (4) and characterized by the fact that each of said passages (2a) belonging to at least one of said pass bars (2) guides a plurality of wires (10) through said hole (2b). 2. PROCESS according to claim 1, characterized in that each pass (2a), belonging to at least one of said pass bars (2), comprises a single hole (2b). 3. PROCESS, according to any one of the preceding claims, characterized by the fact that each passette (2a), belonging to at least one of said passette bars (2), guides two wires (10). 4. PROCESS, according to claim 3, characterized by the fact that each passette (2a), belonging to at least one of the said passete bars (2), guides an elastic thread (10a) and a non-elastic thread (10b) . PROCESS, according to claim 4, characterized in that said non-elastic yarn (10b) is predisposed with a linear density comprised between 22 and 44 dTex and said elastic yarn (10a) is predisposed with a linear density comprised between 33 and 44 dTex. 6. PROCESS, according to claim 5, characterized by the fact that said strips (2a) are predisposed on said stripe bar (2) with a frequency comprised between 40 and 44 strips per inch. 7. PROCESS, according to claim 5 or 6, characterized in that said wires (10) are arranged according to an Atlas type interlacing that has a periodicity of four meshes. Petition 870180037722, of 05/07/2018, p. 6/11 2/2 PROCESS, according to any one of the preceding claims, characterized in that said weaving machine (1) comprises a conveyor system (5) which advances said threads (10) according to directions of advance (6a ) which are different and form an intersection angle (α) between 10 ° and 60 ° between them. 9. FABRIC, characterized by the fact that it is obtained by the process described in claims 1 to 8. Petition 870180037722, of 05/07/2018, p. 7/11 1/4 2/4 3/4